for assuring initial synchronisation or for broadening the capture range

Introduced: January 1980

Full Title

Automatic control of frequency or phase; Synchronisation > using a reference signal applied to a frequency- or phase-locked loop > Details of the phase-locked loop > for assuring initial synchronisation or for broadening the capture range

Of 6 combined children, 3 exist in both systems.

3 codes are CPC-only extensions.

IPC defines codes here since 1980.

Child Classifications

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H03L 7/101 +1 CPC CPC only CPC only
H03L 7/104 CPC only CPC only
H03L 7/105 CPC only CPC only
H03L 7/107 using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth since 1990 +3 CPC IPC+CPC Available in IPC and CPC
H03L 7/113 using frequency discriminator since 1990 IPC+CPC Available in IPC and CPC
H03L 7/12 using a scanning signal since 1980 IPC+CPC Available in IPC and CPC